Alsen is a parish (so called socken) and former municipality (pop.
The seat of the former municipality Alsen, Hov, is situated 50 kilometres northwest of Östersund, the capital of Jämtland.
Petroglyphs in Glösa in the centre of Alsen were made approximately 6 000 years ago.
Alsen and other parts of Jämtland were Christianized in the middle of the 11th century.
There are small industries in Trångsviken on the lake Storsjön, for example Trangia AB which produces alcohol-burning portable stoves.